Group

Error coins can be worth significantly more than normal ones. Start with a standard coin value lookup to identify the normal version, then check if the tool flags any known varieties with higher ranges. For very rare errors you still need expert verification, but it gives a strong starting point. Careful photography helps a lot. For potential errors, a detailed coin value lookup is the first important step. coin value lookup  – it highlighted a couple of minor errors in my collection that turned out to have nice premiums.